let’s try to describe hot runner system, that means between the major running channel of mold and the gate of the molded product, […]
A new technology for actuating stems in valve gated hot runner systems is emerging as a progressive and effective solution. […]
A key component in any hot runner system is the nozzle or drop. Nozzles fall into four main categories: torpedo, valve gate, edge gate and multi tip. Edge gate nozzles are used to gate on a part at 90 degrees to the parting line. There are two varieties of such nozzles. […]
When the above summaries are applied to the acquisition of molds, it should be apparent that a hot runner system can significantly reduce initial cost, tool construction time, and operating expenses of trials, setup, cycle time, maintenance, scrap and secondary operations—and with an efficient valve gate system—no additional equipment is necessary. […]
Aside from the center block motion system, the key element of a stack mold is the hot runner system. The transfer of plastic melt from the machine barrel into the mold center block has traditionally been achieved by a heated sprue bar, […]
The defining characteristic of a stack mold is the two mold parting surfaces or mold split lines. A stack mold does not require much more clamp force than a single-face mold because the projected part surface areas of the cavities on both sides of the center block cancel out each other’s force. […]
Hot runner systems have traditionally used either pneumatic or hydraulic actuation to open and close valve gates. […]
In food packaging, the trend has been toward increasingly thinner walls and higher outputs. To accommodate this trend, […]
When dealing specifically with closure and consumer applications, part and production quality—along with color change performance—are major considerations. Maintaining optimum melt homogeneity is key to achieving this. […]
The manifold is an important component in delivering a consistent and homogeneous melt to the cavity. Today’s industry standard includes naturally balanced melt channels (both with and without level changes), […]